canvas {
    display: block;
    margin: 50px auto;
    box-shadow: -2px -2px 2px #efefef, 5px 5px 5px #b9b9b9;
}

p {
    font-size: 30px;
    text-align: center;
    height: 10px;
}

button {
    margin-bottom: 35px;
    background-color: #bbb;
    border: 2px solid #999;
    color: #222;
    cursor: pointer;
    border-radius: 5px;
    font-size: 25px;
}

#btn {
    margin-right: 30px;
}

#back {
    margin-left: 30px;
}

button:hover {
    color: #fff;
}
